Fiber isn’t only essential for regularity. It helps with weight loss and maintaining a healthy weight, reduces risk of heart disease and diabetes, helps stabilize levels of blood sugar, can lower elevated cholesterol, and helps prevent hemorrhoids and diseases of the colon—but most of us don’t get enough. To see how well you know your fiber facts, try our quiz.

Joint problems become more common with age, but they aren’t inevitable. A diet that’s low in refined carbs and oils, but rich in anti-inflammatory fats and fresh veggies, helps to keep joints healthy. But there’s more to know. Wondering what? Take our quiz to find out.

Alzheimer’s disease may be the most dreaded condition when we think of living a long life, but minor memory lapses or occasional confusion or disorientation don’t always signal the worst-case scenario. Wondering what else can cause such symptoms? Take our quiz to find out.

We can’t live without water. It’s essential for controlling body temperature, eliminating waste, flushing out toxins, protecting organs, lubricating tissues and joints, delivering oxygen and nutrients to cells, and making minerals and other nutrients absorbable. But are you getting enough? Take our quiz to find out

Iron is essential for oxygen to be transported by the blood throughout the body, for oxygen to be used by cells, for synthesis of some hormones and connective tissue, and for production of energy. A deficiency can lead to anemia, fatigue, depression, learning problems, and poor immunity. Do you know where to get it, and how much you need? Find out by taking our quiz.

Olive, coconut, peanut, avocado, walnut ... there are many plant oils to choose from today, and they're generally considered healthy options-especially if they're cold-pressed and unrefined. But is there more to know? Take our quiz to find out.

Counting calories fell out of favor years ago, but that doesn't mean they aren't important. Understanding where calories come from in your diet can help you make good food choices, maintain a healthy weight, and feel better all-around. How well do you know your calories?

It's been all the rage for the past few years, and for good reason. Not only is bone broth a comforting beverage or soup, it's also nutritious and healing, aiding digestion, joint function, immunity, skin, and virtually every other function in the body. Is there more to know? Take our quiz to find out.

Regardless of where you live-in a hot, sunny climate or further north-it's quite possible that you aren't getting enough of the sunshine vitamin. It's estimated that 80 percent of Americans are deficient in vitamin D. To test your knowledge of this essential nutrient, take our quiz.

Food waste is a bigger issue than we may think. Worldwide, one-third of all food is wasted, according to the Food and Agriculture Organization of the United Nations. Being more aware of the problem may help us think of ways to waste less, and this quiz can help you get started.

Sugar excess is one of the biggest food problems of our time. It has been linked to heart disease, cancer, obesity, diabetes, and gout. The more you know, the easier it is to make healthy choices and avoid the not-so-sweet pitfalls. Take our quiz to test your sugar smarts.

GMOs are a hotly debated topic, and concern about their safety has prompted many food manufacturers to use non-GMO ingredients. Some foods or ingredients are labelled as "non-GMO" or certified by the Non-GMO Project (nongmoproject.org). However, there are other ways to tell if a food is likely (or not) to contain GMOs. Do you know how? Take our quiz to find out.

We've all been told to eat more fish, but could those batter-soaked, deep-fried filets and butter- and bacon-rich chowders really be health foods? We should be so lucky! So what are the best ways to get more of those good-for-you omega-3 fats into your diet, and what are the healthiest sources? Take our quiz to find out.

Gluten-free foods are essential for anyone with celiac disease, but many people without the disease prefer to avoid or reduce gluten in their diets. With virtually any type of food available in a gluten-free version, gluten isn't difficult to avoid, but diets can get overly restrictive because of confusion about where gluten does-or doesn't-reside. Take our quiz to check your gluten IQ.

Around the world, millions of people join in Earth Day activities to raise awareness of environmental problems and take action to create a better future. Our planet needs help year-round, but April 22 is a great time to get started. Meanwhile, take our quiz to see if you're up to speed on a few environmental facts.

Whether you savor artisanal varieties on special occasions or get your fix from the office vending machine, chocolate has universal appeal. But how well do you know this delicious concoction? Take our quiz to find out.